Insulator



W. S. COOK INSULATOR June 5, 1928.

Filed Oct. 9, 1923 ATTORNEY Patented June 5, 1928.

WILLIAM S. COOK, OF PARKERSBURG, WEST VIRGINIA.

INsULAToB.

Aipnetimimea orangerv 9, l1923. smaila 667,550.

together with the object of rendering thejoint firm but sufficiently elastic to take care of relative differences inthe expansion of the parts under changing weather conditions. To these and other ends the invention resides in certain improvements and combinations of. parts all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

, The figure is a sectional View of a pin type insulator constructed in accordance with and illustrating one embodiment of my invention.

Similar reference numerals throughout the Vseveral views indicatethe same parts.

I have illustrated in the dra-wing a familiar form of high tension pintype insulator to the assembling of which my improvements are particularly applicable. prises an upper or cap piece l having a groove or saddle 2 on its top to receive and support the line wire or conductor together with a lower or body section. 3 having a socket 4l to receive the supporting pin. The cap section l is provided on its under side with a cent-ral cup shaped cavity 5 that-'is adapted to receive the similarly formed top 6 of the body section which fits it not too closely inorder to leave the two surfaces slightly saaced and form aacavity for the bonding medium at the sides. The lateral outer walls of the portion 6 ofthe bodymember are provided with circumferential ribs 7 giving ita lwave like contour in a longitudinal direction while the inner lateral walls of the cavity 5 of the cap section are simi-- larly shaped to conform thereto in a reciprocal manner so that the one part may be in`V serted in the other with suflicient clearance but the final resulting space between the two will be substantially uniform.

lVhen the parts are brought together in assembling, both they lateral and bottom walls of the cavity 5 of the cap piece 1 are coated with 4aquantity of adhesive or quickv setting cement as indicated at 8 and 9. The opposed walls of the top 6 of the body section 3 are also similarly coated as indicated at 10, the top of the body section and the bottom wall of the cavity being in contact exceptfor the interposed body of adhesive 9.

IThese coatings may be applied by dipping the body section and by painting the interior of the cap section or otherwise as may be most convenient.

After the application of the coating, the two parts are assembled in the relationship shown in which case of course permanent contact is made at the bottom of the cavity with the top of the body section and an annular space is left between the lateral walls of the two sections and between the coatings 8 and l0 thereof. The next step is to apply a body of hard or slow setting cement such ask the Portland cement ordinarily used in such cases in this space. For this purpose, the parts are preferably inverted and a body 11 of the hard cement is poured into the bottom of the annular space. Next a layer of asphaltum or elastic cement l2 is spread upon the top (ultimately the bottom) of the v body 11. Then another body 13 of the hard cement is applied succeeded by a layer 14 of asphaltum on top of which a finalbody of hard cement 15 is deposited.

I have referred to the elastic or quicksetting cement as asphaltum for the reason that this material is particularly adapted for such use. It may be applied while melted by heat and sets sufficiently when cooled.

The structure above described and ,the

method of cementing locks the two parts of. 3

the insulator securely against relative disengagement with a positiveness contributed by the hard or slow-setting cement and yet with a certain elasticity contributed by the elastic or quick-setting cement, while both materials have high insulating value. The last mentioned function of elasticity prevents differential expansions and contractions of the two elements from setting up strains that endanger either the joint itself or the insulator structure as a whole which relative movements of the insulator parts, due to conditions of atmosphere or temperature are well known to those skilled in the art. The laminated or interspersed formation of the cemented joint and the two components thereof gives an opportunity for one part of SFO the insulator to expand or contract relatively to the other inY any direction, that is l f vertically or longitudinally of the supporting pin as well as laterally.

v5 I claim as my invention:

1o both parts wit-h. an elastic cement there being provided intervening bodies of hard cement and longitudinally spaced bodies of elastic cement interspersed therebetween.

2. A method of assembling two part insulators of the character described which comprises ,coating the walls of cooperating projecting and recessed parts with an elastic adhesive and then pouring into the space betweenvthe walls alternate bodies of hard `and of elastic cement. 

